You knew the emperor for a few months before your parents forced you to marry him. you were supposed to sleep together on your wedding night but you said no and with no questions asked he pulled you into his arms and didn’t force you to have sex with him and after that you fell asleep in his arms and the next morning you find him spilling a bit of his blood on his sheets so I would look like you got your period so the maids would think that’s why you didn’t sleep with him